Its Diamante Machine Cut, the facted cut is important to the sparkle quality on the stones, the more "facets" give the best sparkle.
Swarovski Rhinestone have 14 Facet cut for most of the size from SS10 up the SS6 and SS4, have a 12 facet Cut.
Preciosa Rhinestones have a wonderful sparkle and 12 faceted Cut, their Chanton rose are lovely and are cheaper than the Swarovski,
When Rhinestones first came popular here my mate was looking at becoming a wholesaler here and they were closely researched the above info was right a few years back.
I have seen some really good acrylic stones from Korea, the Chinese Acrylic then were not as good, The Chinese hot fix as long as they are glass and a DMC cut normally have a really good sparkle.
The stones I purchased from the link on Ali express I had ss6 and ss10 both had a very good sparkle, the seller lists as 10/12 facets I assume the smaller stones have the 10.
I also find the glass stones stay on the garment longer.
The glass stones are also " moulded" these do not have such sharp edges as the machine cut and wont have the same sparkle quality as the DMC stones.